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      <title>Class Tri3dUtil | HiAPI-C# 2025 </title>
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        <article data-uid="Hi.Geom.Tri3dUtil">



  <h1 id="Hi_Geom_Tri3dUtil" data-uid="Hi.Geom.Tri3dUtil" class="text-break">
Class Tri3dUtil  
  </h1>

  <div class="facts text-secondary">
    <dl><dt>Namespace</dt><dd><a class="xref" href="Hi.html">Hi</a>.<a class="xref" href="Hi.Geom.html">Geom</a></dd></dl>
  <dl><dt>Assembly</dt><dd>HiGeom.dll</dd></dl>
  </div>

  <div class="markdown summary"><p>Utility of <a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>.
Include generator of triangles from points.</p>
</div>
  <div class="markdown conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static class Tri3dUtil</code></pre>
  </div>




  <dl class="typelist inheritance">
    <dt>Inheritance</dt>
    <dd>
      <div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
      <div><span class="xref">Tri3dUtil</span></div>
    </dd>
  </dl>



  <dl class="typelist inheritedMembers">
    <dt>Inherited Members</dt>
    <dd>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">object.Equals(object)</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)">object.Equals(object, object)</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gethashcode">object.GetHashCode()</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gettype">object.GetType()</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone">object.MemberwiseClone()</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.referenceequals">object.ReferenceEquals(object, object)</a>
    </div>
    <div>
      <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.tostring">object.ToString()</a>
    </div>
  </dd></dl>






  <h2 class="section" id="methods">Methods
</h2>


  <a id="Hi_Geom_Tri3dUtil_GenTrisByAlignedLists_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByAlignedLists*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByAlignedLists_System_Collections_Generic_IList_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByAlignedLists(System.Collections.Generic.IList{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByAlignedLists(IList&lt;Vec3d&gt;, IList&lt;Vec3d&gt;, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"></div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByAlignedLists(IList&lt;Vec3d&gt; ps, IList&lt;Vec3d&gt; rrps, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>ps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd></dd>
    <dt><code>rrps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd></dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd></dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GenTrisByAlignedLoops_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByAlignedLoops*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByAlignedLoops_System_Collections_Generic_IList_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByAlignedLoops(System.Collections.Generic.IList{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByAlignedLoops(IList&lt;Vec3d&gt;, IList&lt;Vec3d&gt;, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates triangles between two aligned loops of points.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByAlignedLoops(IList&lt;Vec3d&gt; ps, IList&lt;Vec3d&gt; rrps, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>ps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>First loop of points</p>
</dd>
    <dt><code>rrps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>Second loop of points</p>
</dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection to add the generated triangles to</p>
</dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GenTrisByFan_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByFan*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByFan_System_Collections_Generic_IEnumerable_Hi_Geom_Vec3d__Hi_Geom_Vec3d_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByFan(System.Collections.Generic.IEnumerable{Hi.Geom.Vec3d},Hi.Geom.Vec3d)">
  GenTrisByFan(IEnumerable&lt;Vec3d&gt;, Vec3d)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates triangles in a fan pattern from a sequence of points.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static IEnumerable&lt;Tri3d&gt; GenTrisByFan(this IEnumerable&lt;Vec3d&gt; ps, Vec3d faceNormal = null)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>ps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>The sequence of points</p>
</dd>
    <dt><code>faceNormal</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>Optional face normal for the triangles</p>
</dd>
  </dl>

  <h4 class="section">Returns</h4>
  <dl class="parameters">
    <dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>An enumerable of triangles forming a fan</p>
</dd>
  </dl>











  <a id="Hi_Geom_Tri3dUtil_GenTrisByNumAlignment_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByNumAlignment*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByNumAlignment_System_Collections_Generic_List_Hi_Geom_Vec3d__System_Collections_Generic_List_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByNumAlignment(System.Collections.Generic.List{Hi.Geom.Vec3d},System.Collections.Generic.List{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByNumAlignment(List&lt;Vec3d&gt;, List&lt;Vec3d&gt;, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates triangles between two lists of points with different numbers of points.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByNumAlignment(List&lt;Vec3d&gt; psA, List&lt;Vec3d&gt; psB, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>psA</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.list-1">List</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>First list of points</p>
</dd>
    <dt><code>psB</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.list-1">List</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>Second list of points</p>
</dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection to add the generated triangles to</p>
</dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GenTrisByQuad_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByQuad*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByQuad_Hi_Geom_Vec3d_Hi_Geom_Vec3d_Hi_Geom_Vec3d_Hi_Geom_Vec3d_System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByQuad(Hi.Geom.Vec3d,Hi.Geom.Vec3d,Hi.Geom.Vec3d,Hi.Geom.Vec3d,System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByQuad(Vec3d, Vec3d, Vec3d, Vec3d, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates two triangles from a quadrilateral defined by four points.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByQuad(Vec3d p0, Vec3d p1, Vec3d p2, Vec3d p3, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>p0</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>First point of the quadrilateral</p>
</dd>
    <dt><code>p1</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>Second point of the quadrilateral</p>
</dd>
    <dt><code>p2</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>Third point of the quadrilateral</p>
</dd>
    <dt><code>p3</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>Fourth point of the quadrilateral</p>
</dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection to add the generated triangles to</p>
</dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GenTrisByStar_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByStar*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByStar_Hi_Geom_Vec3d_System_Collections_Generic_IList_Hi_Geom_Vec3d__System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByStar(Hi.Geom.Vec3d,System.Collections.Generic.IList{Hi.Geom.Vec3d},System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByStar(Vec3d, IList&lt;Vec3d&gt;, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates triangles in a star pattern from a center point to a list of points.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByStar(Vec3d starP, IList&lt;Vec3d&gt; ps, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>starP</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>The center point of the star</p>
</dd>
    <dt><code>ps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>The list of points forming the perimeter</p>
</dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection to add the generated triangles to</p>
</dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GenTrisByStar_" data-uid="Hi.Geom.Tri3dUtil.GenTrisByStar*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GenTrisByStar_System_Collections_Generic_IList_Hi_Geom_Vec3d__Hi_Geom_Vec3d_System_Collections_Generic_IList_Hi_Geom_Tri3d__" data-uid="Hi.Geom.Tri3dUtil.GenTrisByStar(System.Collections.Generic.IList{Hi.Geom.Vec3d},Hi.Geom.Vec3d,System.Collections.Generic.IList{Hi.Geom.Tri3d})">
  GenTrisByStar(IList&lt;Vec3d&gt;, Vec3d, IList&lt;Tri3d&gt;)
  
  </h3>

  <div class="markdown level1 summary"><p>Generates triangles in a star pattern from a list of points to a center point.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static void GenTrisByStar(IList&lt;Vec3d&gt; ps, Vec3d starP, IList&lt;Tri3d&gt; dst)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>ps</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a>&gt;</dt>
    <dd><p>The list of points forming the perimeter</p>
</dd>
    <dt><code>starP</code> <a class="xref" href="Hi.Geom.Vec3d.html">Vec3d</a></dt>
    <dd><p>The center point of the star</p>
</dd>
    <dt><code>dst</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ilist-1">IList</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection to add the generated triangles to</p>
</dd>
  </dl>












  <a id="Hi_Geom_Tri3dUtil_GetSegmentsFromPlaneClip_" data-uid="Hi.Geom.Tri3dUtil.GetSegmentsFromPlaneClip*"></a>

  <h3 id="Hi_Geom_Tri3dUtil_GetSegmentsFromPlaneClip_System_Collections_Generic_IEnumerable_Hi_Geom_Tri3d__Hi_Geom_IFlat3d_" data-uid="Hi.Geom.Tri3dUtil.GetSegmentsFromPlaneClip(System.Collections.Generic.IEnumerable{Hi.Geom.Tri3d},Hi.Geom.IFlat3d)">
  GetSegmentsFromPlaneClip(IEnumerable&lt;Tri3d&gt;, IFlat3d)
  
  </h3>

  <div class="markdown level1 summary"><p>Gets line segments resulting from intersecting triangles with a clipping plane.</p>
</div>
  <div class="markdown level1 conceptual"></div>

  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public static List&lt;Segment3d&gt; GetSegmentsFromPlaneClip(this IEnumerable&lt;Tri3d&gt; tris, IFlat3d clipPlane)</code></pre>
  </div>

  <h4 class="section">Parameters</h4>
  <dl class="parameters">
    <dt><code>tris</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1">IEnumerable</a>&lt;<a class="xref" href="Hi.Geom.Tri3d.html">Tri3d</a>&gt;</dt>
    <dd><p>The collection of triangles to clip</p>
</dd>
    <dt><code>clipPlane</code> <a class="xref" href="Hi.Geom.IFlat3d.html">IFlat3d</a></dt>
    <dd><p>The clipping plane</p>
</dd>
  </dl>

  <h4 class="section">Returns</h4>
  <dl class="parameters">
    <dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.collections.generic.list-1">List</a>&lt;<a class="xref" href="Hi.Geom.Segment3d.html">Segment3d</a>&gt;</dt>
    <dd><p>A list of line segments representing the intersection</p>
</dd>
  </dl>












</article>

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